Add public curator notes and U-shaped hall wall hang.

Paintings get editable curator notes with brass plates in the 3D hall, and visit order now uses the far/end wall between left and right.

Co-authored-by: Cursor <cursoragent@cursor.com>

client/src/locales/en/painting.json

@@ -11,5 +11,12 @@
   "tourNotes": "Tour notes",
   "tourNotesFor": "Tour notes · {{title}}",
   "tourNotesEmpty": "No notes for this stop.",
-  "tourStopPosition": "Stop {{current}} of {{total}}"
+  "tourStopPosition": "Stop {{current}} of {{total}}",
+  "curatorNotes": "Curator notes",
+  "curatorNotesEmpty": "No curator notes yet.",
+  "curatorNotesEdit": "Edit",
+  "curatorNotesSave": "Save",
+  "curatorNotesSaving": "Saving…",
+  "curatorNotesCancel": "Cancel",
+  "curatorNotesSaveFailed": "Could not save curator notes."
 }

client/src/locales/ru/painting.json

@@ -11,5 +11,12 @@
   "tourNotes": "Текст экскурсии",
   "tourNotesFor": "Экскурсия · {{title}}",
   "tourNotesEmpty": "Для этой остановки нет текста.",
-  "tourStopPosition": "Остановка {{current}} из {{total}}"
+  "tourStopPosition": "Остановка {{current}} из {{total}}",
+  "curatorNotes": "Заметки куратора",
+  "curatorNotesEmpty": "Заметок куратора пока нет.",
+  "curatorNotesEdit": "Изменить",
+  "curatorNotesSave": "Сохранить",
+  "curatorNotesSaving": "Сохранение…",
+  "curatorNotesCancel": "Отмена",
+  "curatorNotesSaveFailed": "Не удалось сохранить заметки куратора."
 }